Door-lock



UNITED STATES PATENT OFFICE.

CHRISTIAN KNAUER, OF BIRMINGHAM, PENNSYLVANIA, ASSIGNOR TO WARWICK, ATTER- BURY & 00., OF PITTSBURGH, PENNSYLVANIA.

DOOR-LOCK.

Specification of Letters Iatent No. 15,136, dated June 17, 1856. v

To all whom it may concern Be it known that I, CHRISTIAN KNAU R, of Birmingham, county of Allegheny, and State of Pennsylvania, have invented a new and useful Improvement in Right and Left Hand Door-Locks; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of thls specification, in which Figure 1, is a view of the lock (theplate being taken off) when in locked position; Fig. 2, a view of the lock tumbler and lock bolt, when in unlocked position; Fig. 3, a section through the line III of Fig. 1; Fig. 4, a perspective view, of the back side of the lock tumbler; Fig. 5, a perspective view of the back side of the lock bolt; Fig. 6, a perspective view of the guiding block of the lock bolt.

In all these figures the same letters refer to alike parts.

A A is the lock casing; a, a, the plate of the same; b, b, stays supporting the plate a, c, a stud, cast on the casing, provided with a screw hole, to receive the screw by which'the plate is fastened on the casing; B is the follower with arms f, f, forming the latch tumbler; e is a square hole through the follower, which receives the shank or spindle of the latch-knob; C is the latch-bolt; g g, projections or hooks on the same, on which the tumbler arms f f operate.

D is the spring of the latch; 71, the pin of the spring.

E is the lock bolt; h, an oblong opening in the same; m, a block, cast on the casing, which enters into the opening it, for the purpose of guiding the lock bolt.

F is the lock tumbler, which forms a lever, whose fulcrum is in the pin a. The opening (0) in the lever tumbler, into which the pin a enters is oblong for the purpose of allowing the tumbler to move a certain distance up and down, as will be more fully described hereafter. The lever tumbler F is connected with the lock bolt, by means of a pin g, attached to the latter, which enters into the oblong opening 79 in the tumbler; the shape of the opening p is oblong for the same purpose, as mentioned in regard to the shape of the opening 0, the middle of the lever tumbler is cut out in the shape r 1" r, s s s". t, t, are grooves or tracks at reversed 01 as usual.

the lower end of the tumbler, which are curved concentric to the fulcrum n, u is a projection or tongue, which separates the grooves 25, t; o is a nose or projection on top of the guiding block m, by which the lock bolt is kept in its place, when in locked or unlocked position; the nose 0 butting then against the tongue a of the tumbler.

G is the spring of the lock tumbler. It is set on the pin w and operates on the tumbler by acting on the pin 00, which is attached to the tumbler.

In the described lock the latch operates in the ordinary way; the latch bolt being drawn back by the tumbler arms f, f, which operate on the hooks g g of the latch bolt, the spring D forcing the latch bolt forward again. The lock bolt and its tumbler are operated from the keyhole K, which is made so that the key may be inserted either way, The key when inserted in the ordinary way will describethe circle 3 3 y; when inserted reversed it will de scribe the circle a, e, z; the circle 3/, 3 3 is in such a relation to the inside curve 1', r,

r of the opening in the tumbler, that the key will lift the tumbler a distance equal to r, y, and then move itsidewise a distance s z, whereby the lever tumbler is thrown over at its lower end the same distance as above. Thus the vibration or throw of the tumbler is equal in whichever way the key may be inserted. The lock bolt being connected by means of the pin 9 with the tumbler is moved the same distance. The lock bolt, when in locked or unlocked position, is securely kept in its place by the tongue to of the tumbler, abutting against the projection 7) on the guiding block m. When however the lever tumbler is lifted up (by the operation of the key as described above) the tongue 14 comes above the projection o, and the groove t opposite it; the tumbler is then allowed to move sidewise, (the projection passing through the groove). Again, when jection 4), whereby the tumbler is set free to move sidewise. As soon as the tumbler arrived at the end of its stroke, or vibration, (the bolt being then in either locked or unlocked posit-ion) the tumbler is forced by the action of the spring G into the position again, that the tongue t is opposite the projection 2;, whereby the bolt is kept securely in its place. The arrangement of the spring G is such, that its arm d acts on the pin w, of the tumbler, when the same is moved downward, or its arm B on the said pin when the tumbler is moved upward.

The lock as described answers for right or left hand lock, as it is operated equally well, in whichever position the key may be inserted into its double keyhole.

What I claim herein as new and desire to secure by Letters Patent is:

Actuating the bolt of a right and left 20 the tumbler being arranged in relation to 25 the key in such a manner, that the bolt will be thrown out the same distance, in whichever way the key may be inserted, substantially as set forth.

CHRISTIAN KNAUER.

Witnesses HENRY MOSER, J OHN U. BARR. 

